Mathew McBride's website

Poking around on a Mifare card: LibNFC crash course

libnfc is a library for communicating with ISO14443 RFID tags.
You might know these things for their use in smart card ticketing
systems such as Oyster, Octopus, Snapper and myki. But they are
also present in other forms such as photocopy cards, student ID's,
building access controls* and passports. Two forms of ISO14443
dominate: Felica, which debuted in Hong Kong's Octopus RFID ticket
and spread across Asia soon after, and Mifare, which dominates just
about everything else.